Convection heater



FIG. 1 is a top plan view of a convection heater showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a rear elevatioal view thereof; and,

FIG. 6 is a left side elevational view thereof.

The broken-line showing of a cord in FIG. 2 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a convection heater, as shown and described. 